pinmux: stm32f3: Add PA8_PWM1_CH1
pinmux: stm32f3: Add PA8_PWM1_CH1

The nucleo_f334r8 uses STM32F3_PINMUX_FUNC_PA8_PWM1_CH1 inside its
pinmux but it is not defined anywhere.

Add the definition into the pinmux file to fix the build of
nucleo_f334r8 when enabling CONFIG_PWM.

Signed-off-by: Florian Vaussard <ef1e2bd37ca89620283a38ee0519838a257cab3b@gmail.com>

mbolivar/zephyr,mbolivar/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyriot/zephyr,explora26/zephyr,Vudentz/zephyr,kraj/zephyr,punitvara/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,punitvara/zephyr,finikorg/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,mbolivar/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,kraj/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr,zephyriot/zephyr,mbolivar/zephyr,explora26/zephyr,ldts/zephyr,punitvara/zephyr,ldts/zephyr,Vudentz/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,kraj/zephyr,punitvara/zephyr,Vudentz/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,explora26/zephyr,punitvara/zephyr,kraj/zephyr,finikorg/zephyr,finikorg/zephyr,ldts/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr